135554021 has 2 divisors, whose sum is σ = 135554022. Its totient is φ = 135554020.

The previous prime is 135554011. The next prime is 135554071. The reversal of 135554021 is 120455531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96628900 + 38925121 = 9830^2 + 6239^2 .

It is a cyclic number.

It is not a de Polignac number, because 135554021 - 2²² = 131359717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135554011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67777010 + 67777011.

It is an arithmetic number, because the mean of its divisors is an integer number (67777011).

Almost surely, 2^135554021 is an apocalyptic number.

It is an amenable number.

135554021 is a deficient number, since it is larger than the sum of its proper divisors (1).

135554021 is an equidigital number, since it uses as much as digits as its factorization.

135554021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 135554021 is about 11642.7668962322. The cubic root of 135554021 is about 513.6935762867.

It can be divided in two parts, 13555 and 4021, that added together give a cube (17576 = 26³).

The spelling of 135554021 in words is "one hundred thirty-five million, five hundred fifty-four thousand, twenty-one".